1768-CNBR CompactLogix ControlNet Bridge Module
The Allen-Bradley 1768-CNBR is a ControlNet bridge module for CompactLogix systems. It moves deterministic and repeatable data over an open network. Engineers use it in redundancy control and media architectures. The module runs ControlNet at 5 Mbps and handles up to 48 Logix connections. It supports a maximum of 99 ControlNet nodes. A single-slot design keeps panel space tight. Two BNC ports and one RJ45 port cover cabling and PC programming. The 1768-CNBR is now discontinued, so it mainly serves legacy upgrades and spare-parts programs. Oiltech Controls stocks tested units for these cases.
Technical Data
- Brand: Allen-Bradley
- Model: 1768-CNBR
- Series: CompactLogix, Series A and B
- Module type: ControlNet Bridge Module
- Manufacturer: Rockwell Automation
- Communication rate: 5 Mbps
- Logix connections: up to 48
- ControlNet nodes: up to 99
- Current draw: 1.0 A at 5.2VDC
- Heat dissipation: 5.14 W (17.5 BTU/hour)
- Isolation voltage: 30V, tested at 500VAC for 60 seconds
- Ports: 2 x ControlNet BNC, 1 x ControlNet RJ45
- Cable: coaxial RG6 quad shield
- Temperature code: T4
- Enclosure: open style
- Slot width: single slot
- Mounting: DIN rail or panel with M4 / #8 screws
- Dimensions: 132 x 56.7 x 105.1 mm (5.20 x 2.23 x 4.12 in)
- Weight: 0.293 kg (0.64 lb)
- Shipping weight: 2 lbs
- Shipping dimensions: 8 x 8 x 5 in
- UPC: 10612598307507
- UNSPSC: 32151705
- Lifecycle status: discontinued / obsolete
Oiltech Controls Review
- Field feedback shows stable ControlNet links under heavy I/O traffic.
- The 5 Mbps rate suits deterministic control loops without jitter issues.
- Redundant media setups benefit from the dual BNC layout.
- Single-slot form factor fits retrofit panels with limited space.
- RJ45 port simplifies PC programming during commissioning.
- Obsolete status makes tested surplus the practical supply route.
Oiltech Controls’s Insight: Which Devices Fit?
- CompactLogix controllers that need a ControlNet backbone.
- Redundant control systems with dual media paths.
- Legacy lines still running ControlNet I/O racks.
- Media and broadcast control cabinets.
- Panels replacing failed 1768-CNBR units.
- Plants keeping spare modules for critical shutdown windows.
Installation Notes
- Use DIN rail or panel mount with M4 / #8 screws.
- Keep one slot free for airflow.
- Use RG6 quad shield coaxial cable for BNC links.
- Confirm 5.2VDC backplane current budget before install.
- Check node addresses to stay under the 99-node limit.
Setup and Diagnostics
- Program over the RJ45 port from a PC.
- Check link status per BNC channel.
- Watch connection count against the 48 limit.
- Verify isolation with a 500VAC test when required.
- Log node faults early to avoid line stops.
Ordering, Shipping and Warranty
- Dispatch in 24-28 hours after order confirmation.
- Shipping by FedEx, UPS, DHL.
- 12-month warranty on every module.
- Technical check before packing.
- Anti-static wrap and protective carton included.
- Contact: info@oiltechcontrols.com
- WhatsApp: +86 158 8020 0923
Professional FAQ
Q: Can the 1768-CNBR run in a new CompactLogix build?
A: It is discontinued. Most buyers use it for existing ControlNet lines. Check your controller firmware and network plan first.
Q: How do I confirm the module is not a failed unit?
A: Ask for the test report. Oiltech Controls verifies power-up, port status, and connection behavior before shipment.
Q: What should I check before swapping a failed module?
A: Note node addresses, cable type, and slot position. Match the Series A or B version to your chassis.
Q: Is redundant media setup hard on this module?
A: No. The dual BNC ports handle primary and backup paths. Plan cable routing and termination carefully.
Q: How many spares should a plant keep?
A: One spare per critical ControlNet segment is common practice. Obsolete parts face long lead times, so stock early.
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